Update LICENSE copyright holder to Meta Platforms, Inc.

[masonakdev]

Summary

Update LICENSE header text to replace "Facebook, Inc." with "Meta Platforms, Inc." for consistency with current company branding.

What I changed

• LICENSE: updated copyright holder string only

Notes

• No license terms were altered, only the literal copyright holder string.
• I've signed the CLA that was located in CONTRIBUTING.md and followed all other guidelines.